Hello @victorjames,
Welcome to the community forum and thanks for posting!
I am sorry to know that you're facing issues while updating a card. Our security program considers a variety of factors at each transaction/activity to keep you safe. Any activity of adding card/bank can often be blocked or declined if we detect any unusual or suspicious activity or not safe for your account in the future. In this case, I would recommend you to try again at later time.
I hope this helps,
Ayesha
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